Iwaki RD-20/30 pumps are about in the Eheim 1250 league in terms of noise. Where the Eheim will rumble and vibrate though (even the 1048's will vibrate but are otherwise near silent), the Iwaki RD-20/30 doesn't really vibrate to any level that I could detect. Of course if you stick it straight on some wood or metal it will transmit, but even the smallest amount of foam stops that.
Eheim 1048's, even a pair of them, will be quieter so long as they aren't vibrating against something, but the RD-20/30 takes nothing to silence either to someone who's tried bricks and sandbags.
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